| 摘要 |
PROBLEM TO BE SOLVED: To further smoothly overcome level difference by improving on a caster having two wheels. SOLUTION: The caster is provided an auxiliary wheel at a front side and a main wheel at a rear side in a traveling direction, and provided with a ground surface of the auxiliary wheel above the ground surface of the main wheel. A link mechanism is interposed between the auxiliary wheel and the main wheel, thereby moving the main wheel to a rear and upper side in the traveling direction when the main wheel abuts on the level difference. With the movement to the rear and upper side of the main wheel, the auxiliary wheel is swiveled downward. In a state overcoming the level difference, the auxiliary wheel is swiveled upward by an elastic element. COPYRIGHT: (C)2007,JPO&INPIT
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